CVE-2026-61814: Jawn: Quadratic parsing effort in AsyncParser

September 23, 2026

AsyncParser can be forced to perform O(n^2) work on the length of the input. When a single JSON token arrives across many small chunks, each absorb call rescans the incomplete token from the start.

References

github.com/advisories/GHSA-w4cm-gvhj-cgw6
github.com/typelevel/jawn/commit/cddcd5e3387c356b05953f7b2af103d309687e4b
github.com/typelevel/jawn/releases/tag/v1.7.0
github.com/typelevel/jawn/security/advisories/GHSA-w4cm-gvhj-cgw6
nvd.nist.gov/vuln/detail/CVE-2026-61814

Code Behaviors & Features

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